CN104158228A - Non-damping winding permanent-magnet synchronous motor grid connection method - Google Patents
Non-damping winding permanent-magnet synchronous motor grid connection method Download PDFInfo
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- CN104158228A CN104158228A CN201410445609.XA CN201410445609A CN104158228A CN 104158228 A CN104158228 A CN 104158228A CN 201410445609 A CN201410445609 A CN 201410445609A CN 104158228 A CN104158228 A CN 104158228A
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Abstract
The invention discloses a non-damping winding permanent-magnet synchronous motor grid connection method and belongs to the technical field of motor grid connection. The method aims to solve the problems that a non-damping winding permanent-magnet synchronous motor can be only used on a variable-frequency speed control occasion and does not have the power frequency operating capacity of a power grid. According to the method, the non-damping winding permanent-magnet synchronous motor is soft started under the control of a frequency converter, and then, the frequency converter is regulated, wherein firstly, the fundamental frequency of the voltage of the output end of the frequency converter is made to be consistent with the frequency of a power grid; secondly, the difference between the fundamental amplitude of the voltage of the output end of the frequency converter and the voltage amplitude of the power grid is made to be within a preset threshold range; finally, the fundamental phase of the voltage of the output end of the frequency converter is made to be consistent with the phase of the voltage of the power grid; next, the switch-on time moment of a second contact is made to be later than the switch-off time moment of a first contact under the control of the frequency converter, and the operating state that the non-damping winding permanent-magnet synchronous motor is soft started is switch to the power grid operating state. The non-damping winding permanent-magnet synchronous motor grid connection method is used for grid connection of the non-damping winding permanent-magnet synchronous motor.
Description
Technical field
The present invention relates to undamped winding permanent magnet synchronous motor combination method, belong to motor interconnection technology field.
Background technology
The motor of usining at present mainly contains two kinds as the power drive system operational mode driving, and take variable frequency control mode as main governing system and take electrical network power frequency operation as main not governing system.The advantages such as wherein the latter is low with its system cost, reliability is high, control is simple, full load efficiency is high are still widely adopted.
The conventional motor for power frequency operation mainly contains the permanent magnet synchronous motor etc. that asynchronous motor, electrically excited synchronous motor and rotor have damping winding.And the permanent magnet synchronous motor of rotor undamped winding can not pull in voluntarily because it cannot produce asynchronous torque, so seldom for electrical network power frequency operation, but be used for high performance frequency control occasion.Along with in world wide to IE4 level---the demand of super ultra high efficiency motor of one-level efficiency that is equivalent to GB18613-2012 is day by day strong, and the application of permanent magnet synchronous motor has been trend of the times.And the application of expansion undamped winding permanent magnet synchronous motor makes its " dual-use " of realizing high-performance frequency conversion and electrical network power frequency operation simultaneously, all significant to improving power drive system efficiency, saving system cost, raising reliability etc.
At present, the grid-connected problem of rotor undamped winding permanent magnet synchronous motor also lacks system-level solution.
Summary of the invention
The present invention seeks to can only be for frequency control occasion in order to solve undamped winding permanent magnet synchronous motor, and does not have the problem of electrical network power frequency operation ability, and a kind of undamped winding permanent magnet synchronous motor combination method is provided.
Undamped winding permanent magnet synchronous motor combination method of the present invention adopts following two schemes to realize:
The first scheme is: described combination method is realized based on frequency converter, voltage acquisition board, the first contactor and the second contactor,
Voltage acquisition board is for gathering frequency, amplitude and the phase place of line voltage, and offer frequency converter, electrical network three-phase inlet wire R, S, T divide two-way to be connected with undamped winding permanent magnet synchronous motor, the first via is connected with undamped winding permanent magnet synchronous motor with the first contactor through frequency converter successively, and second tunnel the second contactor is connected with undamped winding permanent magnet synchronous motor;
Described combination method is:
Undamped winding permanent magnet synchronous motor is realized soft start under the control of frequency converter, then regulates frequency converter, first makes its output end voltage fundamental frequency consistent with mains frequency; Next makes the difference of its output end voltage fundamental voltage amplitude and line voltage amplitude within predetermined threshold value scope; Finally make its output end voltage fundamental phase consistent with electric network voltage phase;
Then, by Frequency Converter Control, made for second contactor closing moment be later than the first contactor and disconnect constantly, realize undamped winding permanent magnet synchronous motor and switch to operation of power networks state from soft start running status.
The method that undamped winding permanent magnet synchronous motor switches to frequency converter running status from operation of power networks state is:
First by Frequency Converter Control, the second contactor was disconnected constantly early than first contactor closing moment, then undamped winding permanent magnet synchronous motor is carried out to rotor-position online tracing, rotor position information is offered to frequency converter, frequency converter is brought into operation, realize thus undamped winding permanent magnet synchronous motor and switch to frequency converter running status from operation of power networks state.
First scheme is: described combination method is realized based on frequency converter, voltage acquisition board, the first contactor, the second contactor and reactor,
Voltage acquisition board is for gathering frequency, amplitude and the phase place of line voltage, and offer frequency converter, electrical network three-phase inlet wire R, S, T divide two-way to be connected with undamped winding permanent magnet synchronous motor, the first via is connected with undamped winding permanent magnet synchronous motor through frequency converter, reactor and the first contactor successively, and second tunnel the second contactor is connected with undamped winding permanent magnet synchronous motor;
Described combination method is:
Undamped winding permanent magnet synchronous motor is realized soft start under the control of frequency converter, then regulates frequency converter, first makes its output end voltage fundamental frequency consistent with mains frequency; Next makes the difference of its output end voltage fundamental voltage amplitude and line voltage amplitude within predetermined threshold value scope; Finally make its output end voltage fundamental phase consistent with electric network voltage phase;
Then, by Frequency Converter Control, disconnected constantly second contactor closing moment early than the first contactor, realize undamped winding permanent magnet synchronous motor and switch to operation of power networks state from soft start running status.
The method that undamped winding permanent magnet synchronous motor switches to frequency converter running status from operation of power networks state is:
First by Frequency Converter Control, the second contactor was disconnected be constantly later than first contactor closing moment, then undamped winding permanent magnet synchronous motor is carried out to rotor-position online tracing, rotor position information is offered to frequency converter, frequency converter is brought into operation, realize undamped winding permanent magnet synchronous motor and switch to frequency converter running status from operation of power networks state.
In above-mentioned two schemes:
Undamped winding permanent magnet synchronous motor switches to the adjustment process of operation of power networks state from soft start running status, and frequency converter adopts vector control mode, and the adjusting of Negotiation speed ring makes inverter output terminal voltage fundamental frequency consistent with mains frequency.
Undamped winding permanent magnet synchronous motor switches to the adjustment process of operation of power networks state from soft start running status, frequency converter adopts vector control mode, by comparing inverter output terminal voltage fundamental amplitude and line voltage amplitude, regulate direct-axis current, make the difference of the two within predetermined threshold value scope.
Undamped winding permanent magnet synchronous motor switches to the adjustment process of operation of power networks state from soft start running status, frequency converter adopts vector control mode, adopt phase-locked loop to obtain inverter output terminal voltage fundamental phase place and electric network voltage phase, according to the two phase difference governing speed fourth finger order, make its output end voltage fundamental phase consistent with electric network voltage phase again.
Frequency converter adopts position sensor or position Sensorless Control, when adopting position sensor to control, on undamped winding permanent magnet synchronous motor, rotor-position sensor is installed.
Advantage of the present invention: the present invention has realized the permanent magnet synchronous motor switching operation of power networks of undamped winding, it adopts frequency control to realize the soft start of motor, and by governing speed fourth finger, make, regulate direct-axis current, adopt two phase-locked loop in conjunction with measures such as phase difference adjusters respectively, make inverter output terminal voltage fundamental meet grid-connected required frequency, amplitude and phase condition.When needs adopt converting operation, also can pass through rotor-position online tracing, undamped winding permanent magnet synchronous motor switchback frequency converter is moved.
The grid-connected switching one-time success rate of the present invention is high, not only saved frequency inverter capacity, improved power drive system operational efficiency, reduced system cost, and expanded the application of undamped winding permanent magnet synchronous motor, realize the dual-use of undamped winding permanent magnet synchronous motor, improved efficiency and the reliability of system.
Accompanying drawing explanation
Fig. 1 is the rotor structure schematic diagram of undamped winding permanent magnet synchronous motor of the present invention; Described rotor consists of rotor core 6 and permanent magnet 7, rotor surface undamped winding, thereby do not possess self-startup ability;
Fig. 2 is that the operational system of undamped winding permanent magnet synchronous motor combination method of the present invention forms schematic diagram;
Fig. 3 is the internal module theory diagram of frequency converter;
Fig. 4 is the grid-connected process flow diagram of undamped winding permanent magnet synchronous motor;
Fig. 5 is inverter output terminal voltage fundamental phase place and electric network voltage phase comparison flow chart in undamped winding permanent magnet synchronous motor network process;
Fig. 6 is inverter output terminal voltage fundamental phase adjusted flow chart in undamped winding permanent magnet synchronous motor network process;
Fig. 7 is that undamped winding permanent magnet synchronous motor is from operation of power networks switchback frequency converter running flow chart.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1 to Fig. 7, undamped winding permanent magnet synchronous motor combination method described in present embodiment, this combination method is realized based on frequency converter 1, voltage acquisition board 2, the first contactor 3 and the second contactor 4
Voltage acquisition board 2 is for gathering frequency, amplitude and the phase place of line voltage, and offer frequency converter 1, electrical network three-phase inlet wire R, S, T divide two-way to be connected with undamped winding permanent magnet synchronous motor, the first via is connected with undamped winding permanent magnet synchronous motor with the first contactor 3 through frequency converter 1 successively, and second tunnel the second contactor 4 is connected with undamped winding permanent magnet synchronous motor;
Described combination method is:
Undamped winding permanent magnet synchronous motor is realized soft start under the control of frequency converter, then regulates frequency converter 1, first makes its output end voltage fundamental frequency consistent with mains frequency; Next makes the difference of its output end voltage fundamental voltage amplitude and line voltage amplitude within predetermined threshold value scope; Finally make its output end voltage fundamental phase consistent with electric network voltage phase;
Then, by frequency converter 1, control and made for be later than the first contactor 3 the second 4 closing moments of contactor to disconnect constantly, realize undamped winding permanent magnet synchronous motor and switch to operation of power networks state from soft start running status.
The analog signal that in present embodiment, voltage acquisition board 2 gathers offers frequency converter, as the reference of its regulation output terminal voltage after analogue-to-digital converters ADC is converted to digital signal in frequency converter.Voltage acquisition board 2 is connected between the second nearly grid side in road and the analogue-to-digital converters of frequency converter 1.
Shown in Fig. 3, the control system of frequency converter inside is comprised of speed ring and electric current loop, adopts vector control mode.Wherein rotor-position detects and can adopt position sensor or position-sensor-free mode to obtain.Rotor mechanical angle position θ
rafter differential, obtain speed feedback signal ω
mf, with rotary speed instruction ω
mrelatively by speed ring adjuster output quadrature axis given value of current i
q.The given i of direct-axis current
dprovide according to actual needs.And the two is from line current sampling, detects the electrical degree information θ obtaining in conjunction with rotor-position
e, the feedback signal i obtaining through Park conversion
qf, i
dfrespectively relatively after, through electric current loop adjuster, export the given u of cross, straight shaft voltage
q, u
d.After anti-Park conversion and space vector pulse width modulation SVPWM, produce pwm signal and supply with inverter circuit again, and then drive undamped winding permanent magnet synchronous motor.
Embodiment two: below in conjunction with Fig. 7, present embodiment is described, present embodiment is described further execution mode one, the method that undamped winding permanent magnet synchronous motor switches to frequency converter 1 running status from operation of power networks state is:
First by frequency converter 1, control the second contactor 4 was disconnected constantly early than the first 3 closing moments of contactor, then undamped winding permanent magnet synchronous motor is carried out to rotor-position online tracing, rotor position information is offered to frequency converter 1, frequency converter 1 is brought into operation, realize thus undamped winding permanent magnet synchronous motor and switch to frequency converter 1 running status from operation of power networks state.
The running of present embodiment, contactor is for realizing the switching of undamped winding permanent magnet synchronous motor between frequency converter operation and operation of power networks.When switching to operation of power networks from frequency converter operation, if reactor is not installed between frequency converter and contactor, grid side contactor closing moment should be later than frequency converter side contactor and disconnects constantly; If reactor is installed between frequency converter and contactor, grid side contactor closing moment can disconnect constantly early than frequency converter side contactor.When switching to frequency converter operation from operation of power networks, contactor sequence of movement is contrary with said sequence.
At soft start, to grid-connected speed regulation process, frequency converter control system adopts vector control mode.The adjusting of Negotiation speed ring makes inverter output terminal voltage fundamental frequency consistent with mains frequency.By comparing inverter output terminal voltage fundamental amplitude and line voltage amplitude, regulate direct-axis current, make the difference of the two within the scope of predetermined threshold value, meet grid-connected required amplitude condition.To inverter output terminal voltage fundamental and line voltage, adopt respectively phase-locked loop to obtain the two phase place, and according to the order of phase difference governing speed fourth finger, make the two phase place meet grid-connected required phase condition.After grid-connected condition all meets, by aforementioned sequential control contactor action, make undamped winding permanent magnet synchronous motor switch to operation of power networks from frequency converter operation.
When needs make undamped winding permanent magnet synchronous motor move from operation of power networks switchback frequency converter, first by aforementioned sequential control contactor action, by online tracing, obtain afterwards the rotor-position of undamped winding permanent magnet synchronous motor, finally make frequency-changing control system work, recover frequency converter operation.
Embodiment three: present embodiment is described below in conjunction with Fig. 1 to Fig. 7, undamped winding permanent magnet synchronous motor combination method described in present embodiment, this combination method is realized based on frequency converter 1, voltage acquisition board 2, the first contactor 3, the second contactor 4 and reactor 5
Voltage acquisition board 2 is for gathering frequency, amplitude and the phase place of line voltage, and offer frequency converter 1, electrical network three-phase inlet wire R, S, T divide two-way to be connected with undamped winding permanent magnet synchronous motor, the first via is connected with undamped winding permanent magnet synchronous motor through frequency converter 1, reactor 5 and the first contactor 3 successively, and second tunnel the second contactor 4 is connected with undamped winding permanent magnet synchronous motor;
Described combination method is:
Undamped winding permanent magnet synchronous motor is realized soft start under the control of frequency converter, then regulates frequency converter 1, first makes its output end voltage fundamental frequency consistent with mains frequency; Next makes the difference of its output end voltage fundamental voltage amplitude and line voltage amplitude within predetermined threshold value scope; Finally make its output end voltage fundamental phase consistent with electric network voltage phase;
Then, by frequency converter 1, control the second 4 closing moments of contactor were disconnected constantly early than the first contactor 3, realize undamped winding permanent magnet synchronous motor and switch to operation of power networks state from soft start running status.
In conjunction with Fig. 4, the concrete implementation step of undamped winding permanent magnet synchronous motor network process is as follows:
Step 1: provide after grid-connected enable command, implementation step 101, by the instruction of regulation and control system speed ring, realizes inverter output terminal voltage fundamental frequency consistent with line voltage frequency;
Step 2: implementation step 102, relatively inverter output terminal voltage fundamental amplitude and line voltage amplitude;
Step 3: implementation step 103, judges whether inverter output terminal voltage fundamental amplitude meets grid-connected condition;
Step 4: if inverter output terminal voltage fundamental amplitude does not meet grid-connected condition, implementation step 104, by regulating direct-axis current i
dregulate inverter output terminal voltage fundamental amplitude.Its concrete steps are: if the difference of inverter output terminal voltage fundamental amplitude and line voltage amplitude is less than permission threshold value, reduce direct-axis current i
d, make it to play increasing magnetic action; If the difference of inverter output terminal voltage fundamental amplitude and line voltage amplitude is greater than permission threshold value, increase direct-axis current i
d, make it to play demagnetizing effect;
A step 5: if inverter output terminal voltage fundamental amplitude meets grid-connected condition, implementation step 105, compares inverter output terminal voltage fundamental phase place and electric network voltage phase, and its concrete steps are as mistake! Do not find Reference source.Shown in;
Step 6: implementation step 106, judges whether inverter output terminal voltage fundamental phase place meets grid-connected condition;
A step 7: if inverter output terminal voltage fundamental phase place does not meet grid-connected condition, implementation step 107, regulates inverter output terminal voltage fundamental phase place, and its concrete steps are as mistake! Do not find Reference source.Shown in;
Step 8: if inverter output terminal voltage fundamental phase place meets grid-connected condition, implementation step 108, control contactor action; After contactor action, complete grid-connected.
A mistake! Do not find Reference source.Concrete implementation step as follows:
Step 2 one: implementation step 201, the line voltage being collected by voltage acquisition board is done to Clark and convert;
Step 2 two: implementation step 202, utilize phase-locked loop to obtain electric network voltage phase;
Step 2 three: implementation step 203, inverter output terminal voltage fundamental is done to Clark conversion;
Step 2 four: implementation step 204, utilize phase-locked loop to obtain inverter output terminal voltage fundamental phase place;
Step 2 five: implementation step 205, it is poor that the inverter output terminal voltage fundamental phase place being obtained by phase-locked loop and electric network voltage phase are done, and completes comparison procedure.
A mistake! Do not find Reference source.Concrete implementation step as follows:
Step 3 one: implementation step 301, the difference of the inverter output terminal voltage fundamental phase place obtaining and electric network voltage phase is done to necessary trigonometric function and process;
Step 3 two: implementation step 302, produces rotational speed regulation instruction to the phase difference after processing through phase difference adjuster;
Step 3 three: implementation step 303, produce speed ring rotary speed instruction, by fine setting undamped winding permanent magnet synchronous motor rotating speed, regulate inverter output terminal voltage fundamental phase place.
A mistake! Do not find Reference source.Concrete implementation step as follows:
Step 4 one: implementation step 401, control contactor action, sequence of movement is contrary with sequence of movement in described step 8;
Step 4 two: implementation step 402, obtains undamped winding permanent magnet synchronous motor rotor position by online tracing;
Step 4 three: implementation step 403, the work of frequency converter internal control system, completes anti-switching.
Embodiment four: below in conjunction with Fig. 7, present embodiment is described, present embodiment is described further execution mode three, the method that undamped winding permanent magnet synchronous motor switches to frequency converter 1 running status from operation of power networks state is:
First by frequency converter 1, control and the second contactor 4 was disconnected be constantly later than the first 3 closing moments of contactor, then undamped winding permanent magnet synchronous motor is carried out to rotor-position online tracing, rotor position information is offered to frequency converter 1, frequency converter 1 is brought into operation, realize undamped winding permanent magnet synchronous motor and switch to frequency converter 1 running status from operation of power networks state.
In embodiment two and embodiment four, undamped winding permanent magnet synchronous motor from the process of operation of power networks switchback frequency converter operation, when the sequence of movement of two contactors and undamped winding permanent magnet synchronous motor switch to operation of power networks state from soft start running status described in reversed in order.
The running of present embodiment is consistent in principle with the running describing in detail in embodiment two.
Embodiment five: present embodiment is described below in conjunction with Fig. 3, present embodiment is described further execution mode one, two, three or four, undamped winding permanent magnet synchronous motor switches to the adjustment process of operation of power networks state from soft start running status, frequency converter 1 adopts vector control mode, and the adjusting of Negotiation speed ring makes frequency converter 1 output end voltage fundamental frequency consistent with mains frequency.
In present embodiment, the adjusting of speed ring is according to speed ring instruction ω
mrealize.
Embodiment six: present embodiment is described below in conjunction with Fig. 3, present embodiment is described further execution mode one, two, three, four or five, undamped winding permanent magnet synchronous motor switches to the adjustment process of operation of power networks state from soft start running status, frequency converter 1 adopts vector control mode, by comparing inverter output terminal voltage fundamental amplitude and line voltage amplitude, regulate direct-axis current, make the difference of the two within predetermined threshold value scope.
In present embodiment, by regulating direct-axis current i
drealize the adjusting of inverter output terminal voltage fundamental amplitude and line voltage amplitude.
Embodiment seven: present embodiment is described below in conjunction with Fig. 3, present embodiment is described further execution mode one, two, three, four, five or six, undamped winding permanent magnet synchronous motor switches to the adjustment process of operation of power networks state from soft start running status, frequency converter 1 adopts vector control mode, adopt phase-locked loop to obtain inverter output terminal voltage fundamental phase place and electric network voltage phase, according to the two phase difference governing speed fourth finger order, make its output end voltage fundamental phase consistent with electric network voltage phase again.
Embodiment eight: present embodiment is described below in conjunction with Fig. 3, present embodiment is described further execution mode one, two, three, four, five, six or seven, frequency converter 1 adopts position sensor or position Sensorless Control, when adopting position sensor to control, on undamped winding permanent magnet synchronous motor, rotor-position sensor is installed.
In combination method of the present invention, between frequency converter 1 and the first contactor 3, can select according to actual needs to install reactor 5.
Claims (8)
1. a undamped winding permanent magnet synchronous motor combination method, this combination method is realized based on frequency converter (1), voltage acquisition board (2), the first contactor (3) and the second contactor (4),
Voltage acquisition board (2) is for gathering frequency, amplitude and the phase place of line voltage, and offer frequency converter (1), electrical network three-phase inlet wire R, S, T divide two-way to be connected with undamped winding permanent magnet synchronous motor, the first via is connected with undamped winding permanent magnet synchronous motor with the first contactor (3) through frequency converter (1) successively, and second tunnel the second contactor (4) is connected with undamped winding permanent magnet synchronous motor;
It is characterized in that, described combination method is:
Undamped winding permanent magnet synchronous motor is realized soft start under the control of frequency converter, then regulates frequency converter (1), first makes its output end voltage fundamental frequency consistent with mains frequency; Next makes the difference of its output end voltage fundamental voltage amplitude and line voltage amplitude within predetermined threshold value scope; Finally make its output end voltage fundamental phase consistent with electric network voltage phase;
Then, by frequency converter (1), control and to make the second contactor (4) closing moment be later than the first contactor (3) to disconnect constantly, realize undamped winding permanent magnet synchronous motor and switch to operation of power networks state from soft start running status.
2. undamped winding permanent magnet synchronous motor combination method according to claim 1, is characterized in that, the method that undamped winding permanent magnet synchronous motor switches to frequency converter (1) running status from operation of power networks state is:
First by frequency converter (1), control the second contactor (4) was disconnected constantly early than the first contactor (3) closing moment, then undamped winding permanent magnet synchronous motor is carried out to rotor-position online tracing, rotor position information is offered to frequency converter (1), frequency converter (1) is brought into operation, realize thus undamped winding permanent magnet synchronous motor and switch to frequency converter (1) running status from operation of power networks state.
3. a undamped winding permanent magnet synchronous motor combination method, this combination method is realized based on frequency converter (1), voltage acquisition board (2), the first contactor (3), the second contactor (4) and reactor (5),
Voltage acquisition board (2) is for gathering frequency, amplitude and the phase place of line voltage, and offer frequency converter (1), electrical network three-phase inlet wire R, S, T divide two-way to be connected with undamped winding permanent magnet synchronous motor, the first via is connected with undamped winding permanent magnet synchronous motor through frequency converter (1), reactor (5) and the first contactor (3) successively, and second tunnel the second contactor (4) is connected with undamped winding permanent magnet synchronous motor;
It is characterized in that, described combination method is:
Undamped winding permanent magnet synchronous motor is realized soft start under the control of frequency converter, then regulates frequency converter (1), first makes its output end voltage fundamental frequency consistent with mains frequency; Next makes the difference of its output end voltage fundamental voltage amplitude and line voltage amplitude within predetermined threshold value scope; Finally make its output end voltage fundamental phase consistent with electric network voltage phase;
Then, by frequency converter (1), control the second contactor (4) closing moment is disconnected constantly early than the first contactor (3), realize undamped winding permanent magnet synchronous motor and switch to operation of power networks state from soft start running status.
4. undamped winding permanent magnet synchronous motor combination method according to claim 3, is characterized in that, the method that undamped winding permanent magnet synchronous motor switches to frequency converter (1) running status from operation of power networks state is:
First by frequency converter (1), control and the second contactor (4) to be disconnected be constantly later than the first contactor (3) closing moment, then undamped winding permanent magnet synchronous motor is carried out to rotor-position online tracing, rotor position information is offered to frequency converter (1), frequency converter (1) is brought into operation, realize undamped winding permanent magnet synchronous motor and switch to frequency converter (1) running status from operation of power networks state.
5. according to the undamped winding permanent magnet synchronous motor combination method described in claim 1,2,3 or 4, it is characterized in that,
Undamped winding permanent magnet synchronous motor switches to the adjustment process of operation of power networks state from soft start running status, frequency converter (1) adopts vector control mode, and the adjusting of Negotiation speed ring makes frequency converter (1) output end voltage fundamental frequency consistent with mains frequency.
6. according to the undamped winding permanent magnet synchronous motor combination method described in claim 1,2,3 or 4, it is characterized in that,
Undamped winding permanent magnet synchronous motor switches to the adjustment process of operation of power networks state from soft start running status, frequency converter (1) adopts vector control mode, by comparing inverter output terminal voltage fundamental amplitude and line voltage amplitude, regulate direct-axis current, make the difference of the two within predetermined threshold value scope.
7. according to the undamped winding permanent magnet synchronous motor combination method described in claim 1,2,3 or 4, it is characterized in that,
Undamped winding permanent magnet synchronous motor switches to the adjustment process of operation of power networks state from soft start running status, frequency converter (1) adopts vector control mode, adopt phase-locked loop to obtain inverter output terminal voltage fundamental phase place and electric network voltage phase, according to the two phase difference governing speed fourth finger order, make its output end voltage fundamental phase consistent with electric network voltage phase again.
8. according to the undamped winding permanent magnet synchronous motor combination method described in claim 1,2,3 or 4, it is characterized in that, frequency converter (1) adopts position sensor or position Sensorless Control, when adopting position sensor to control, on undamped winding permanent magnet synchronous motor, rotor-position sensor is installed.
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| CN105337540A (en) * | 2015-11-25 | 2016-02-17 | 北京金自天正智能控制股份有限公司 | Two-level circuit board for achieving permanent magnet synchronous motor frequency conversion soft start and grid-connected control |
| CN105375849A (en) * | 2015-11-25 | 2016-03-02 | 北京金自天正智能控制股份有限公司 | Three-level circuit board for realizing permanent magnet synchronous motor variable-frequency soft start and grid-connected control |
| CN105281618B (en) * | 2015-11-25 | 2018-03-02 | 北京金自天正智能控制股份有限公司 | A kind of permagnetic synchronous motor frequency conversion soft start and grid-connected control method |
| CN111279604A (en) * | 2017-09-13 | 2020-06-12 | 西门子股份公司 | Operation of a permanent magnet excited synchronous machine |
| CN111279604B (en) * | 2017-09-13 | 2023-09-01 | 西门子股份公司 | Operation of a permanent magnet excited synchronous motor |
| CN109150061A (en) * | 2018-09-20 | 2019-01-04 | 山东奥卓电气科技发展有限公司 | A kind of heavy-duty motor work frequency conversion switching system and its control method |
| CN109150061B (en) * | 2018-09-20 | 2022-02-08 | 山东奥卓电气科技发展有限公司 | High-power electric power frequency conversion switching system and control method thereof |
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